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Whitebeam JavaScript Libraries
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JavaScript and XML are at the core of the Whitebeam architecture. Application
level abstractions are provided by templates.
Lower level abstractions - or utility functions are provided via a set of JavaScript classes
that "do useful things". The overhead of building functionality in the core Presentation Engine (as opposed to templates) is
that of additional code and associated data memory that's then present in each HTTP process. If not
careful this can lead to process bloat and limit the number of concurrent pages a web-server
can process. Listed below are the utility JavaScript classes that supplement those provided by
JavaScript itself. Quick reference - click on a class to go directly to it's definition : | Class | Description | Documentation |
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Binary | The core JavaScript language has very vew data-types. None of those are suitable for
storing raw binary data such as images or file content. Such objects are often a vital
part of a web-application. The Binary class allows applications to encapsulate and manipulate raw binary data. It
also provides a file-system interface allowing both directories to be opened and read. | tutorial |
spec | JSONexp | Implementation of an IETF RFC 7159 'JSON' encoder (stringify) and decoder (parse)
This class is new to Whitebeam release 1.3.32 | spec | GraphicImage | Another common web-application requirement is the manipulation of images - for example to upload images
from users and resize to create thumbnails. The GraphicImage class provides the application developer
with all the tools to manipulate JPEG, GIF and PNG images, including resizing, cropping and adding text. | tutorial |
spec | HttpRequest | The HttpRequest object allows an application to send HTTP requests to other servers (or to itself). This
is a core building block for technologies such as SOAP and XML/RPC. Note historically HttpRequest dealt with HTTP protocol requests. This functionality has been
extended over time so the class now supports file transfer over: HTTP, HTTPS, FTP and SFTP. | tutorial |
spec | SmtpRequest | SMTP (Simple Mail Transfer Protocol) is the means by which email is moved across the Internet.
The SmtpRequest class in Whitebeam provides very thorough support for the construction and
transmission of sophisticated email messages. As well as simple text emails - the SmtpRequest class supports the construction of
hierarchical multi-part mime encoded emails, which in turn allows emails with embedded
images and rich text. | tutorial |
spec | WbString | A sub-class of the standard Javascript 'String'.
This class is new to Whitebeam release 1.3.5 The main contribution of this class is a set of static (class) methods that provide access to fast native
string encoding/decoding and hashing functions. | spec | PgsqlConnection | These classes provide raw access to PostgreSQL databases. While
the Whitebeam templates provide high level abstractions that store information in a Whitebeam Schema, this
class allows an application to go beyond the template functionality and build any application specific database. | tutorial |
spec | XmlParser
XmlGeneric
XmlTag
XmlText
XmlComment
XmlCData
XmlPi
XmlNodeSet | Whitebeam is built on an XML framework. This set of classes provide DOM like manipulation of XML tree structures. This
includes both the tree of the page being executed and any other XML/HTML document you wish to process. For example
text returned in an HTTP SOAP response can be parser then searched (using XPath for example). Click on the class name on the left for a full definition of that class. Use the tutorial link on the right to
understand how these classes can be used in your applications. | tutorial |
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